Going to build my first motor, been researching for years and still have just a few small questions,
My block will be a 96-2000 4 bolt main, one piece seal, From summit.

1. I'm wanting to use the TF super 23, 215's for the heads, will they be a direct bolt on this block? There web site suggest the 195's and don't even list the 215's as a option. why?

2. I am keeping this car a manual transmission, do I need to go with internally balanced rotating assembly or externally balanced? Does it matter?

3. When picking my pistons, some say -5cc others say -12cc. To get my compression ratio to where I want it, do I add this number to the cc's on the heads or subtract it? Example a 67cc head with the -5cc pistons would give me 72cc's of combustion space?

personally save money and go with an a hydro roller motor from like an 87 to 90 maro or vette or something those motors mak explosive power and you can save some money for a nice set of heads and so are you looking for high compression or what i dont understand what your asking?

I'm asking, just like it says, I don't understand how to put it any more clearly than I have, even with the example? do pistons with negative number add to the total combustion space or subtract? Thinking about it in picture form, to me adds to the combustion space. Dome pistons lessen the combustion space. Correct?

Yes, I am looking to achieve a certain number for the combustion space in my particular build, to give me the desired compression I'm after.

The only resin I'm asking this is because if I'm going to spend $2,000 on a rotating assembly I'm gonna make sure I know whether or not to go with dome, flat, or dished pistons as well as what -/+ cc that's going to match up with the rest of my build.